FCFS first Come first service

/*
First come first serve FCFS

Requirements:
1> with struct definition program: program number, priority number (arrival time), time required for CPU operation

2> Input Process sequence

3> sort output by priority number
*/
#include <stdio.h>
#include <string.h>
#define N 100
typedef struct TIME
{
int reachtime; Priority number (program arrival time)
int runningtime; CPU Operation time
}time;

typedef struct INFORMATION
{
Long ID; Program number

Time pay;
}inf;

int n;
void Readpay (INF p[]);
void Desortbythefirst (INF p[]);

void main ()//main function
{
INF P[n];
struct time;
int sum=0;
int i;
Long number;
printf ("Please enter the number of programs: (<100)");
scanf ("%d", &n);
Readpay (P);
for (i=0;i<n;i++)
{
Sum=sum+p[i].pay.reachtime+p[i].pay.runningtime;
}
printf ("\n\n\t\t\t#### #总周转时间为:%d milliseconds #####\n\t\n", sum);
printf ("\t\t\t#### #按优先级高低排序输出 #####\n\n");
Desortbythefirst (P);

}

void Readpay (INF p[])//1. Input program Data
{
int i;
for (i=0;i<n;i++)
{
printf ("\n\t Please enter%d program number:", i+1);
scanf ("%ld", &p[i].id);
printf ("Please enter the arrival time for%d programs:", i+1);
scanf ("\t%d", &p[i].pay.reachtime);
printf ("Please enter the CPU time for%d programs:", i+1);
scanf ("\t%d", &p[i].pay.runningtime);

printf ("\t\n%10ld%d\t%d\t\n turnaround time:%d\n", P[i].id,p[i].pay.reachtime,p[i].pay.runningtime,p[i].pay.reachtime+p[i]. Pay.runningtime);

}
}

void Desortbythefirst (INF p[])//2. Sort output by priority level
{
int i,j,k;
int all;
int a1,a2;
INF temp;

for (i=0;i<n-1;i++)
{
K=i;
for (j=i+1;j<=n;j++)
{
A1=p[i].pay.reachtime+p[i].pay.runningtime;
A2=p[j].pay.reachtime+p[j].pay.runningtime;
if (A1<A2)
{
TEMP=P[J];
P[j]=p[i];
P[i]=temp;
}
}
printf ("\n\t by priority rank: \ n");
printf ("\n\t No. \ t program number \ t arrival time \ t run time \t\n");
for (k=0;k<n;k++)
{

All=p[k].pay.reachtime+p[k].pay.runningtime;
printf ("\t%d%10ld\t%d\t\t%d\t\n", K+1,p[k].id,p[k].pay.reachtime,all);
}

}

}

#####################################################

Operation Result:

FCFS first Come first service